Grinding machine



Oct. 11, 1938.

E. s. MUMMERT GRINDING MACHINE 7 Filed July 18, 1936 2 Sheets-Sheet l INVENTOR ERVIN 5. 'MUMMERT ATTOR N EY Oct. 11, 1938. E 5 MUMMERT 2,132,640

GRINDING MACHINE Filed July 18, 1936 2 Sheets-Sheet 2 INVENTOR ERV\N S. MUMMERT' ATTO R N EY Patented Oct. 11,1938 I n 2,132,640

UNITED STATES PATENT orrlcc GRINDING MACHINE Ervin S. Mummert, Hanover, Pa, assignor to Mummert-Dixon Company, Hanover, Pa., a corporation of Pennsylvania Application July 18, 1936, Serial No. 91,257

' 3 Claims. (01. 51' 99) This invention relates -to grinding machines circle a similarly formed pulley on the shaft l8 and more particularly to the type of grinding of the grinding wheel l3, said pulley being machines known as swing frame grinders in covered by a suitable hood or guard l9, as shown which the machine is suspended from-an overin Fig. 1.

'5 head support by a flexible element such as a The grinding wheel I3 is also partly covered chain, cable or the like. by a hood or guard 20 which is fastened to the An object of the invention is to provide an wheel head frame l2 by, means of bolts 2|. improved swing frame grinding machine which Projecting from the grinding wheel hood 20 is suspended in such a way that both longitudinal are handles 22 for the operator of the machine. and lateral adjustments may be made, so that In the specific type of machine herein shown 10 the machine will be perfectly balanced without and described, the grinding wheel I3 is shown the necessity of employing any additional disposed substantially in alinement with the end balancing weights or the like. v of the main supporting frame-H, the frame l2 -Another object of the invention isto provide of said grinding wheel being offset at one end an improved swing frame grinding machine havin the manner shown in Fig. 1, so as to provide a 15 ing its suspending arm or hanger adjustably support for the driving pulley (not shown) of mounted on a supplementary frame, which latter the grinding wheel l3.

in turn is adjustably mounted on the main frame Extending lengthwise of the machine ,and of the machine. n covering the driving belts ll; is a cover 23 which 2 Another object of the invention is to provide is preferably formed of sheet metal. an improved swing frame grinding machine of The motor 15 is mounted on a suitable platthe character mentioned, which is simple in form 24 which is supported by the motor carryconstruction, and reliable and exact in function ing frame M as shown in Fig. 2. under all conditions of service. 7 Also supported by the motor carrying frame I4 25 The invention also comprises certain new and is a bracket 25 having a boss 26 for receiving one 25 useful improvements in the construction, arend of an auxiliary or supplementary supporting rangement and combination of the several parts frame 21.

of which it is composed, as will be hereinafter The supplementary supporting frame 21' commore 'fullydescribed and claimed. V 7 prises a tube or section of heavy pipe which is 3() 'In the accompanying drawings: somewhat shorter in length than the length of 30' Figure '1 is a plan of a swing frame grinding the main supporting frame H. p machine constructed according to the present The outer end of the supplementary supportinvention I n 7 ing frame 21 is secured to a suitable connector or Fig. '2; is a side elevation of the structure shown bracket 28. n

' The connector or bracket 28 is formed with a 3 in Fig. 1;' 5

Fig. 3 is a vertical transverse section taken main body portion 29 which snugly fits themain 0n t e line f supporting frame ll. Extending upwardly from 4 is a similar section taken on the line the main bodyportion 29 of the connector or of nd bracket 28 is an arm, the upper end of which is 40 Fig. 5 is a similar section taken on the line formed with a slot 30 through which is inserted 4t) 5-5 of Fig. 2. I t the shank of a bolt 3! which is employedfor Referring to the drawings, the improvedv securing theouter free end of the supplementary grinding machine Comprises a main S pp g supporting frame 2'! to the connector or bracket frame II, which is preferably though not neces- 28.

sarily constructed of a suitable length of heavy The main body portion 29 of the connector or 4 pipe or tubing. bracket 28 is rigidly secured to the main sup- Mounted on one end of the main supporting porting frame H by means of set screws 32 (see frame II is a wheel head frame 12, which sup- Fig. 5). por s a grinding wheel l3. The bracket 25 which supports the inner end Mounted on the opposite end of the main supof the supplementary supporting frame 21 is 50 porting frame I l is a motor carrying frame l4, adjustably mounted on the motor carrying frame upon which is mounted an electric motor l5. M for sliding movement transversely of the ma- Theshaft of the electric motor I5 is provided chine. For this purpose the base of the bracket with a pulley lfi'having grooves formed therein 25 is formed with slots 33, as shown in Fig. 1,

for a plurality of belts ll. The belts I1 enfor the reception of the shanks of bolts 34. 55

Loosely mounted on the supplementary supporting frame 21, is a bearing 36, for a suspending arm or hanger 31.

The bearing 36 is retained in position against longitudinal movement with respect to the supplementary supporting frame 21 by means of collars 38. The collars in turn are rigidly secured to the supplementary supporting frame 21 by means of set screws 39.

The lower end of the suspending arm or hanger 31 is pivotally connected to the bearing 36 by means of a pin 40 which is carried by the bearing 36 in the manner clearly shown in Fig. 4. The pin 40 is transversely disposed so that the hanger arm 31 is free to swing in a direction lon gitudinally of the machine, and since the bearing 36 is loosely mounted on the supplementary supporting frame 21, said bearing and the suspending arm or hanger 31 pivotally connected thereto, are free to swing in a direction at right angles to the longitudinal swinging movement which can be partaken of only by the suspending arm or hanger 31.

As shown in Fig. 4, the lower end of the suspending'arm or hanger 31 is connected to the bearing 36 at a point offset to the main supporting frame ll of the machine.

The upper end of the suspending arm or hanger 31 is laterally disposed with respect to the main body portion thereof, and said upper end carries an eye 4| for the reception of a hook or other device (not shown) on the lower end of a chain or cable from which the machine is adapted to be suspended. In order that the machine can be moved in all directions, the eye 4! is loosely connected to the upper end of the suspending arm or hanger 31 by a swivel joint of any approved type.

When the machine is suspended by the arm or hanger 31, it is adapted to be evenly balanced, and in order to obtain such balance after the parts have been assembled, the bracket 25, the connector bracket 28, and the hanger bearing 36 are shifted until the entire machine is uniformly balanced, it being assumed that the machine is suspended from a suitable flexible element, as has been heretofore described, which is connected to the eye 4| of the arm 31.

When this adjustment of the above elements has been effected, the bolts 3| and 34 and. set screws 39 are tightened, thereby retaining the movable parts of the machine relatively fixed, so that the machine will remain in proper balance when put into use.

In order to obtain correct balance of the machine it was necesasry to provide means for shifting the position of the suspending arm or hanger 31 with respect to the main supporting frame ll of the machine, and in order to effect such shifting of the hanger 31 it has been necessary to pivotally mount said hanger on an auxiliary or supplementary supporting frame which latter can also be shifted with respect to the main frame.

The transverse balance of the machine is effected by moving bracket 25 and the connector 28 in such a way that the supplementary supporting frame is shifted transversely with respect to the main supporting frame l l. The longitudinal balance is obtained by shifting the position of the hanger bearing 36 inwardly or outwardly of the supplementary supporting frame 21. In this way both transverse and longitudinal balance of the machine can be readily obtained without the use of any additional balancing weights.

Having thus described my invention, what I claim is:

1. A grinding machine comprising an elongated supporting frame with a power unit at one end, a grinding tool at the other end, driving connections between the power unit and the grinding tool, a supplementary supporting frame superposed with respect to the main supporting frame, means for shifting the relative position of the supplementary supporting frame laterally with respect to the main supporting frame, a hanger, means for pivotally supporting said hanger on the supplementary supporting frame, and-means for adjusting the hanger supporting means longitudinally with respect to the supplementary supporting frame whereby to balance the entire machine when the same is supported from said hanger.

2. In a grinding machine, an elongated main frame, a motor supported by said frame at one end, a grinding tool supported by said frame at the other end, a driving connection between said motor and said grinding tool, a supplementary frame, adjustable means connecting one end of said supplementary frame with said main frame at the motor end thereof, a bracket rotatably mounted on an intermediate portion of said main frame, means for adjustably connecting the other end of the supplementary frame with said bracket, a hanger, and means constituting a universal joint for connecting the hanger with said supplementary frame.

3. A grinding machine comprising a main supporting frame, a motor mounted on one end of said main frame, a grinding tool mounted on the other end of said main frame, driving connections between the motor and the grinding tool, a supplementary supporting frame paralleling the main frame and disposed in a plane above the main frame, means for adjustably connecting each end of said supplementary supporting frame to said main frame whereby the relative position of said supplementary supporting frame with respect to the main frame can be shifted, a bearing loosely mounted on said supplementary supporting frame for rotary movements transversely with respect tosaid supplementary supporting frame, and a hanger pivotallyconnected to said bearing and adapted to swing in directions at right angles to the transverse rotary -movements of said bearing.

- ERVIN S. MUMMERT. 

